Mold jolting and ramming machine



Oct. 31, 1933. RADIGAN 1,932,803

MOLD JOLTING AND RAMMING MACHINE Filed Dec. 9, 1929 2 Sheets-Sheet lINVENTOR Jrr 5 @476 ATTORNEYS Patented Oct. 31, 1933 I John E. Radigan,Detroit, Mich assignor to Bohn Aluminum & Brass Corporation, Detroit,Mich, a corporation of Michigan Application December 9, 1929, Serial No.412,876

5 Claims. (01. 259-72) 5 to jolts to compact the sand or the like. An-

;10. to may be withdrawn from the formedmold' '1 port.

other object is to so construct the machine that the mold. carrier isreciprocated Without wearing the'guides for the support for the carrierso that the carrier and the pattern secured therewithout damaging thelatter. A further object is to provide an improved means for guiding thecarrier'during its movement relative to the support and for securing thecarrier to the sup- With these as well asother objects in View, theinvention resides in the novel features of construction and combinationsand arrangements oi parts as more fully hereinafter set forth.

' In the drawings:-

Figure 1 is a perspective view of a mold vibrating machine embodying myinvention;

Figure 2 is a side view thereof partly in section; Figure 3 is a crosssection on the line 3--3 ofFigure 2.-

In general, the mold jolting and ramming machine is of that type inwhich the carrier for the mold is vertically reciprocated and jolted tocompact the mold material or sand. '1 is the base of the machine havingat its rear side the column 2. :3 is the support above the base andhaving at -its'rearside the column 4 which slidablyenga ges verticalguideways in the guide 5 secured to the horizontal shaft 6, which isjour- 351 naled in the upper end of the column 2. '7 are in front of thecolumn 4. This latter column is in the nature of a yoke through whichthe upper end of the guide 5 extends and the cross bar 10 of this yokehas secured to it the rod 11 of a piston, which slidably'engages thevertical cylinder 12 mounted in the column 2. For raising the piston andthereby raising the support 3 a suitable medium under pressure, such ascompressed air, may be admitted to the lower end of the cylinder 12 toraise the piston therewithin, whichthrough' its rod raises the column 4and consequently the support' -13is a plate above the support 3 andadapted to have secured thereto the pattern l4 and to support the moldframe 15, which encircles the pattern and receives the mold material orsand 16. Theplate is yieldably clamped upon the support 3 by meansexerting substantially constant pressure upon the plate. This meanscom-l prises -devices at-opposite sides of the plate which are alike, sothat but one will be described. 17

is a vertical cylinder secured to a side of the support 3 and dependingtherefrom laterally beyond the upper portion of the'base 1. Thiscylinder has an upper closed end providedwith the port 18 for thepassage of a medium under pressure, which is preferably compressed air.19 is a piston slidable within'the cylinder 17 and hav ing the depending-rod'20 extending below the cylinderand abutting the crossbar 21. crossbar is rigidly connected at itsopposite ends at equal distances from thepiston rod 20 to the plate 13, the connection comprising the threadedrods or bolts' 22 and the nuts 23 ty in'g the cross bar and platetogether and the specing sleeves 24 encircling the bolts and-abuttingthe cross bar and plate. and" holding the same at fixed distances apart.The sleeves 24 slidably extend through thebrackets 25 secured to thesupport 3 and therebyguicle the plate during its vertical movementsrelative to the support. i

For subjecting the plate 13 to a series of jolts to compact the moldingmaterial or sand, I have provided the stationary vertical cylinder 26'which is located centrally within the base land has in its lower closedend the port 27 for the passage of a medium under pressure, which ispreferably compressed air. 28 isaplunger slid ably engaging the cylinder26 and extending upwardly through its upper open end and having anenlarged upper end portion for engagement with the plate '13, and theupper end of the cylinder 26, the support 3 having anopening'therethrough providing clearance for the cylinder and plunger.The'portion or" the plungerwhich extends Within the cylinder is iormed-with--the axially extending recess 29' which, when the plunger is inits lowermost position, encircles but is laterally spaced from the valvechamber 30, which is secured to the lower end of the icy-linder 26 andextends vertically upward therefrom.

This v'alve chamber has an open lower end regis} 9.0

tering with the port 27 and has at its upper end the port 31 openinginto the recess 29 and providing for the passage of air from the :port27 to the recessso thattthis air may exert an upward pressure upon thev.upper end of :the re.- 05

cess and the lower end of the plunger surround.-

ing the recess. '32 is a cylindrical .valvewithin valve chamber and thelateral lugs 3.4 near its 19 upper end also slidably engaging the valvechamber. The wall of this valve is provided with the series of openings35 for the passage of air through the valve into the valve chamber. Theupper end of this valve is closed and has the annular shoulder 36 forclosing the port 31 and further has the stem 37 extending verticallyupward through the port 31 and spaced fromits edges. 38 is a memberextending axially of and threadedly engaging the plunger 28 and havingits lower end engageable with the upper end of the stem 37 to controlthe operation of the valve 32 in closing or opening the port 31, therebeing the coil spring 39 within the valve chamber and abutting theannular flange 33 of'the 'valve and the lower end of the cylinder 26 fortending to resiliently move the valve to closed position. The upperportion of the plunger 28 is preferably provided with the recess 40 forreceiving the upper end portion of the threaded member 38 so that thisthreaded member cannot contact with the plate, 13.

As thus far described, and with the parts in position as shown in Figure3, the valve in the compressed air line is opened to permit thecompressed air to enter the cylinders 17 through the ports 18. Then thevalve in the compressed air line is opened to permit the passage ofcompressed air throughthe port 27 of the cylinder 26. This air passesupwardly through the lower portion of the valve chamber 30 into thevalve 32 outwardly through its openings 35, through the upper portion ofthe valve chamber 30, through the port 31 and into the recess 29, someof the air passing to the lower end of the plunger 28. The pressureexerted by the compressed air upon the plunger 28. at the upper end ofthe recess 29 and at the lower end of the plunger surrounding the recessis greater than that of the compressed air exerted uponthe pistons 19 sothat the plunger 28 is raised and it in turn raises the plate 13supported thereby. As the plunger 28 is being raised the spring 39forces the valve 32 upwardly, as controlled by the threaded member 38,until thisvalve closes the port 31, at which time the air pressure iscut oil and the plunger 28 has uncoveredthe exhaust port 41in the wallof the cylinder 26. ,When the momentum of the mold carrier plate and theplunger has been overcome, theyare lowered both by gravity and the forceexerted by the compressed air upon the pistons to forcibly bringtheenlarged upper end portion of the plunger against the upper end ofthe stationary cylinder 26, thereby jolting the mold ma-' terial or sandto compact the same. During the lowering ofthe plate and plungercompressed air is. forced outwardly through the exhaust port 41 and thethreaded control member 38 finally forces the valve 32 downwardly toopen position,

lagainallowing compressed air to act upon the plunger to raise the same.

For thepurpose of assisting in quickly raising the plunger, I haveprovided the cylinder 26 with the intake port 42 above the exhaust port41 for receiving compressed air, the passage of which is controlled bythe same valve that controls the passage of compressed air to the port27. The plunger 28 is formed with the annular groove 43 and with theytransverse ports 44 leading from this annular groove to the recess 29.The location of the port 42 and the groove 43 is such that when theplunger is in its lowermost position the two. register to providevanother means for the passage of compressed air to raise the plunger.

: .When the mold material or sand'has been compacted the valvecontrolling the passage of compressed air to the ports 27 and 42 isclosed and air is then admitted to the lower end of the cylinder 12 toraise the support 3 and the plate 13 clamped thereto by air pressure toforce the board 45, which has been placed upon the mold frame, againstthe arms '7. The guide 5 and all the associated parts are then rotatedto invert the same, after which air is admitted to the opposite end ofthe cylinder 12 to raise the plate 13 and the pattern 14 securedthereto. The completed mold may then be removed and the parts returnedto their original positions.

With the construction as above described, it will be seen that thepattern and mold carrier is yieldably secured to the support by meansexerting substantially constant pressure upon the carrier, since thepressure of the compressed air acting upon the clamping pistons issubstantially constant, inasmuch as during the jolting operation theupward movement of the carrier and consequently the upward movement ofthe clamping pistons forces the air in the cylinders above these pistonsback into the air line so that its pressure is not appreciablyincreased. It will also be seen that with this construction the patternand mold carrier is effectively guided and the air pressure actuateddevices for clamping this carrier to the support serve to facilitate thedesired reciprocation of the carrier for compacting the mold material orsand.

What I claim as my invention is:

1. In a mold jolting and ramming machine, the combination with asupport, a pattern and mold carrier above said support, and verticallyreciprocable means for delivering a series of jolts to said carrier, ofmeans between said support and carrier for yieldably securing saidcarrier to said support comprising cylinders on opposite sides of andsecured to one of said members, pistons slidably engaging said cylindersand connected to the other of said members, and means for conducting airunder pressure to said cylinders.

2. In a mold jolting and ramming machine, the

combination with a support, a pattern and mold carrier above saidsupport, and reciprocable means for delivering a series of impacts in avertical direction to'said carrier, of means between said support andcarrier for yieldably securing said carrier to said support, comprisingcylinders 1 secured to opposite sides of said support and having portsfor air under pressure at their upper ends, pistons slidably engagingsaid cylinders and having rods extending below their lower ends, andbars engaging said piston rods and connect- 1 ed to said carrier. 1 3.In a mold jolting and ramming machine, the combination with a support, apattern and mold carrier above said support, and vertically reciprocablemeans periodically engageablewith the carrier for delivering a series ofimpacts to the latter, of means between said support and carrier foryieldably securing the carrier to the support including, a cylinderconnected to one of the latter members, a piston within said cylinderconnected to the other of said last mentioned members, and means forconducting air under pressure to said cylinder tending to move thelatter and piston therein relatively in a direction to yieldably clampthe carrier to the support. 1 4. In a mold: jolting and ramming machine,the combination with a support, a mold supporting member positionedabove the support, and means located below the mold supporting memberfor delivering a series of jolts to the under surface 1 located belowsaid member for delivering a series of impacts to the under surfacethereof, of fluid pressure operated means between the support and moldcarrying member for continuously exerting a pressure upon the lattermember to yieldably secure the same to said support.

JOHN E. RADIGAN.

